I went shopping, and left Harry in the car. Then, I returned to find his head covered in hives. Called work, and talked to one of the vets. She told me to give him some benedryl when I got hime. If it didn't get better, take him into the clinic and call her, and she'd tell me what to give him.

Poor dude! Molly did that once too after she locked herself in the bathroom for about an hour. She was so freaked out that her entire body just hived right up...they called her lumpy at the e-vets. She's neurotic though, so that explains it.